[mcchampion]

I don't think the W3C DOM document has anything the developers haven't agreed to. The problem is that it's an incomplete, intrinsically out of date, and often buggy subset of the the WHATWG living standard.

I agree that the W3C value proposition COULD be to publish a snapshot that describes what's actually implemnted. That might be a way forward here, but it requires a lot of work to define what "actually implemented" means in a useful way, and to check the test results and update the document (or build an automated way to harvest resources such as https://wpt.fyi/dom ).